Association using an intermediate table appears as AssociationNotFoundError.

Currently, [Rails6] Create Slack-like chat app with Action Cable - Qiita article to create a chat room for asynchronous communication. I was able to create a chat room, but I get an error when I see

ActiveRecord::AssociationNotFoundError in Rooms#index
Association named 'user' was not found on Room; perhaps you misspelled it?
Extracted source (around line #9):
              
  </div>

    <%@rooms.each do | room | %>
      <ul>
        <%=link_to room_path(room), method::get do%>
          <class="recommended_title">Title:<%=room.name%>>span class="share_comment_time">%=room.created_at.to_s(:datetime_jp)%>/span>>>>

We have created an intermediate table called room_user, where we associate it as follows:

Room_user Model

class RoomUser<ApplicationRecord
  belongs_to —room
  belongs_to —user
end

Room Model

class Room<ApplicationRecord
  has_many —room_users
  has_many:users,through::room_users,dependent::destroy
  has_many:messages,dependent::destroy

  def template
    ApplicationController.render.renderpartial: 'messages/message', locals: {message:self}
  end
end

User Model

 has_many:room_users
   has_many:rooms, through::room_users
   has_many:messages,dependent::destroy

Rooms/Index.html.erb

<%=render "shared/header"%>

<body class="shares_body">
  <h1class="share_title">CHAT ROOMS</h1>
  <div class="share_btn_wrapper">
    <%=link_to"◎Create a chat room◎", new_room_path, class: "share_btn"%>
  </div>

    <%@rooms.each do | room | %>
      <ul>
        <%=link_to room_path(room), method::get do%>
          <class="recommended_title">Title:<%=room.name%>>span class="share_comment_time">%=room.created_at.to_s(:datetime_jp)%>/span>>>>
        <%end%>
      </ul>
    <%end%>
  <%=paginate@rooms%>

    <div class="top_page_link">
      <%=link_to "Back to top page", "/"%>
    </div>
</body>


<%=render "shared/footer"%>

Room Controller

class RoomsController <ApplicationController

  def index
    @rooms=Room.all.includes(:user).order("created_at DESC").page(params[:page]).per(10)
  end

  def new
    @room=Room.new
  end

  def create
    @room=Room.new(room_params)
    [email protected]
      redirect_to rooms_path
    else
      render 'new' 
    end
  end

  def show
    @messages=Message.all.includes(:user).order(:id)
    @message=current_user.messages.build
  end

  private

  defroom_params
    param.require(:room).permit(:name,user_ids:[])
  end
end

When I create a room, it is reflected in the column, so I made it appear in the Index view file, but the error I mentioned at the beginning appears.
I'm wondering if the association has been completed, but an association-related error occurred and I checked other files, but I didn't know where the error was, so I asked you a question to help me.
I've just started studying, and I'm sorry for the poor explanation and code, but I appreciate your cooperation.

ruby-on-rails ruby ajax

2022-09-29 22:50

1 Answers

I solved myself.
I don't think I needed .includes(:user) in the controller, so I don't think there's a user tied to the room, but I'm going to check it out myself a little bit more.

2022-09-29 22:50

If you have any answers or tips

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